How to Write to an Existing File in Python

In this example we will show how to write to an existing file and overwrite any existing content using the open() function in Python.

Source Code

f = open('myfile3.txt', 'w')
f.write("Overwrite everything.")
f.close()

# Open and read the file after the overwriting:
f = open('myfile3.txt', 'r')
text = f.read()
print(text) 

Output:

Overwrite everything.